Glorious Anthem

The static team-pump enchantment in its definitive form: a flat, permanent boost to every creature you control, no upkeep, no decay, no conditions on what qualifies. That permanence is the entire design argument. A combat trick buys one creature one turn; this buys the whole board indefinitely, which is what turns a row of small bodies trading one-for-one into a row trading one-for-two, and what breaks a stalled ground when an extra point of power lets attackers push past blockers. The price sits at a deliberate spot: cheap enough to land before your creatures commit, yet a card that pays you back only in proportion to the board you already have. Drop it onto an empty battlefield and it is an IOU, returning value only once the bodies arrive. Glorious Anthem set the template later white aggro enchantments were measured against, from Honor of the Pure narrowing the bonus to a single color to Intangible Virtue keying off tokens to Spear of Heliod stapling on a deterrent clause. Each trades the clean universality of +1/+1 to all your creatures for something more specialized; this is the unrestricted original, which is also why it demands the most of your deck. It rewards going wide and offers nothing to the player going tall, and its strength scales precisely with how committed you are to flooding the board before it ever resolves.